Default variable details

Some of debops.ferm default variables have more extensive configuration than simple strings or lists, here you can find documentation and examples for them.


The ferm__*_rules variables are YAML lists which define what firewall rules are configured on a host. The rules are combined together in the ferm__combined_rules variable which defines the order of the rule variables and therefore how they will affect each other.

Each entry in the ferm__*_rules lists is a YAML dictionary. The entry needs to have the name parameter that specifies the rule name, otherwise it will be skipped.

The result is stored as ferm__parsed_rules variable. This order allows modification of the default rules as well as rules defined by other Ansible roles using Ansible inventory variables.

The rules are stored in the /etc/ferm/rules.d/ directory and the filename format is:


The rule "weight" is determined by a given rule type which can be overridden if needed, see the type, weight and weight_class parameters for more details.

Each rule defined in a dictionary uses specific parameters. The parameters described here are general ones, mostly usable on the main "level" and are related to management of rule files. The parameters related to specific ferm rules are described in Firewall Rule Definitions documentation.


Name of the firewall rule to configure. An example rule definition:

  - name: 'accept_all_connections'
    type: 'accept'
    accept_any: True

Either a string or a YAML text block that contains raw ferm configuration options, or a list of YAML dictionaries which specify firewall rules. If this parameter is not specified, role will try and generate rules automatically based on other parameters specified on the "first level" of a given rule definition. Most of the other parameters can be specified on the "second level" rules and will apply to a given rule in the list.

Example custom rule definition that restarts nginx after firewall is modified:

  - name: 'restart_nginx':
    type: 'post-hook'
    rules: '@hook post "type nginx > /dev/null && systemctl restart nginx || true";'

Example list of rule definitions which will open access to different service ports; rules will be present in the same file:

  - name: 'allow_http_https'

      - dport: 'http'
        accept_any: True

      - dport: 'https'
        accept_any: True

Optional. Specify the state of the firewall rule file, or one of the rules included in that file. Supported states:

  • present: default. The rule file will be created if it doesn't exist, a rule will be present in the file.
  • absent: The rule file will be removed, a rule in the file will not be generated.
  • ignore: the role will not change the current state of the configuration file. This value does not have an effect on the rules inside the file.
Optional. Add a comment in the rule configuration file, either as a string or as a YAML text block.
Optional. Name of the template to use to generate the firewall rule file. Currently only one template is available, rule so this option is not useful yet.

Optional. Specify the rule type as a name, for example accept or reject. Different rule types can use different rule parameters, the rule type also affects the "weight" used to order the configuration files. Weight of the different rules is specified in the ferm__default_weight_map variable and can be overridden using the ferm__weight_map variable.

List of known rule types can be found in the Firewall Rule Definitions documentation.

Optional. Override the rule type with another type, to change the sort order of the configuration files. This parameter does not affect the ferm configuration template, only the resulting filename.
Optional. Additional positive or negative number (for example 2 or -2) which will be added to the rule weight affecting the file sorting order.


This is a set of legacy debops.ferm variables, kept to allow older roles to be usable with new variables. You should use the ferm__*_rules variables instead in new configuration, the legacy variables will be removed at some point.

List of ferm INPUT rules that should be present or absent in the firewall rule set. The same format is also used for ferm_input_group_list, ferm_input_host_list and ferm_input_dependent_list. Each rule is defined as a YAML dict with the following keys:

Name of template file to use, required. Format: <type>.conf.j2
List of destination ports to manage, required.
Optional. Custom name used in the generated rule filename
Optional. Helps with file sorting in rule directory
Optional. Custom filename instead of a generated one
Optional. State of the rule. Defaults to present. Possible values: present or absent

Depending on the chosen type, many additional variables are supported. Please check the template files located in the templates/etc/ferm/ferm.d directory.